Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)FUEL SYSTEM (DIESEL)FUEL LEAKS OUTSIDE OF ENGINE (6.6L)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Fuel Leaks Outside Of Engine (6.6L)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fuel Leaks Outside Of Engine (6.6L)
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For component locations, see COMPONENT LOCATIONS .
- Remove upper intake manifold sight shield using following procedure:
- Remove retaining bolt in front of shield.
- Lift up on front of shield.
- Lift shield off rear bracket.
- Clean all fuel lines between fuel injection pump and fuel injectors using brake cleaning solvent, and let dry.
- Add 8 ounces of oil dye to fuel tank. On dual tanks, add dye to front, or primary tank.
- Connect scan tool to Data Link Connector (DLC).
- Start and idle engine for 3-5 minutes.
- Command fuel pressure control to 23,206 psi (160 MPa) with scan tool.
- Inspect for fuel leaks around fuel injection pump, junction block, fuel rails, and fuel injector supply lines with High Intensity Black Light Kit (J 28428-E). Tighten or replace any leaking lines or components. See 6.6L V8 DIESEL article in ENGINES, or appropriate REMOVAL, OVERHAUL & INSTALLATION article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.